, a video emerges of what appears to be opposition fighters executing government soldiers. >> the un says that if the video is authenticated, the action would constitute a war crime. >> as their prisoners cower in terror, rebels celebrate. this video is said to of been recorded in northwestern syria. government forces and rebels have been fighting there for weeks. on thursday, rebels stormed several army checkpoints. they appear to have captured these government soldiers. in the video, rebels yell, "you are assad's dogs" at their captives, and then they prayed. after that, they fired round after round, killing at least 10 of those prisoners. the united nations is trying to verify the video and says the killings probably constituted a war crime and those responsible should be punished. >> it looks very likely that this is a war crime, another one. unfortunately, this could be the latest in a stream of documented executions by opposition as well as government forces and its affiliated with them. >> there's been heavy fighting with government planes bombing rebel positions near the turkish b